11978515 has 8 divisors (see below), whose sum is σ = 14999328. Its totient is φ = 9166080.

The previous prime is 11978507. The next prime is 11978539. The reversal of 11978515 is 51587911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11978515 - 2³ = 11978507 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51966 + ... + 52195.

It is an arithmetic number, because the mean of its divisors is an integer number (1874916).

Almost surely, 2^11978515 is an apocalyptic number.

11978515 is a deficient number, since it is larger than the sum of its proper divisors (3020813).

11978515 is a wasteful number, since it uses less digits than its factorization.

11978515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104189.

The product of its digits is 12600, while the sum is 37.

The square root of 11978515 is about 3460.9991331984. Note that the first 3 decimals coincide. The cubic root of 11978515 is about 228.8061325214.

The spelling of 11978515 in words is "eleven million, nine hundred seventy-eight thousand, five hundred fifteen".